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  <div class="headertitle"><div class="title">encode.c</div></div>
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<a href="encode_8c.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a id="l00001" name="l00001"></a><span class="lineno">    1</span><span class="comment">/* encode.c -- encoding and decoding of CoAP data types</span></div>
<div class="line"><a id="l00002" name="l00002"></a><span class="lineno">    2</span><span class="comment"> *</span></div>
<div class="line"><a id="l00003" name="l00003"></a><span class="lineno">    3</span><span class="comment"> * Copyright (C) 2010,2011 Olaf Bergmann &lt;bergmann@tzi.org&gt;</span></div>
<div class="line"><a id="l00004" name="l00004"></a><span class="lineno">    4</span><span class="comment"> *</span></div>
<div class="line"><a id="l00005" name="l00005"></a><span class="lineno">    5</span><span class="comment"> * This file is part of the CoAP library libcoap. Please see</span></div>
<div class="line"><a id="l00006" name="l00006"></a><span class="lineno">    6</span><span class="comment"> * README for terms of use.</span></div>
<div class="line"><a id="l00007" name="l00007"></a><span class="lineno">    7</span><span class="comment"> */</span></div>
<div class="line"><a id="l00008" name="l00008"></a><span class="lineno">    8</span> </div>
<div class="line"><a id="l00009" name="l00009"></a><span class="lineno">    9</span><span class="preprocessor">#ifndef NDEBUG</span></div>
<div class="line"><a id="l00010" name="l00010"></a><span class="lineno">   10</span><span class="preprocessor">#  include &lt;stdio.h&gt;</span></div>
<div class="line"><a id="l00011" name="l00011"></a><span class="lineno">   11</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00012" name="l00012"></a><span class="lineno">   12</span> </div>
<div class="line"><a id="l00013" name="l00013"></a><span class="lineno">   13</span><span class="preprocessor">#include &quot;coap_config.h&quot;</span></div>
<div class="line"><a id="l00014" name="l00014"></a><span class="lineno">   14</span><span class="preprocessor">#include &quot;<a class="code" href="coap_8h.html">coap.h</a>&quot;</span></div>
<div class="line"><a id="l00015" name="l00015"></a><span class="lineno">   15</span><span class="preprocessor">#include &quot;<a class="code" href="mem_8h.html">mem.h</a>&quot;</span></div>
<div class="line"><a id="l00016" name="l00016"></a><span class="lineno">   16</span><span class="preprocessor">#include &quot;<a class="code" href="encode_8h.html">encode.h</a>&quot;</span></div>
<div class="line"><a id="l00017" name="l00017"></a><span class="lineno">   17</span> </div>
<div class="line"><a id="l00018" name="l00018"></a><span class="lineno">   18</span><span class="comment">/* Carsten suggested this when fls() is not available: */</span></div>
<div class="line"><a id="l00019" name="l00019"></a><span class="lineno">   19</span><span class="preprocessor">#ifndef HAVE_FLS</span></div>
<div class="foldopen" id="foldopen00020" data-start="{" data-end="}">
<div class="line"><a id="l00020" name="l00020"></a><span class="lineno"><a class="line" href="encode_8c.html#a671b4261b2d24de8696258a8efb0f359">   20</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="encode_8c.html#a671b4261b2d24de8696258a8efb0f359">coap_fls</a>(<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i) {</div>
<div class="line"><a id="l00021" name="l00021"></a><span class="lineno">   21</span>  <span class="keywordflow">return</span> <a class="code hl_function" href="encode_8c.html#a5732d87decbffe771159ea02a5e25488">coap_flsll</a>(i);</div>
<div class="line"><a id="l00022" name="l00022"></a><span class="lineno">   22</span>}</div>
</div>
<div class="line"><a id="l00023" name="l00023"></a><span class="lineno">   23</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00024" name="l00024"></a><span class="lineno">   24</span> </div>
<div class="line"><a id="l00025" name="l00025"></a><span class="lineno">   25</span><span class="preprocessor">#ifndef HAVE_FLSLL</span></div>
<div class="foldopen" id="foldopen00026" data-start="{" data-end="}">
<div class="line"><a id="l00026" name="l00026"></a><span class="lineno"><a class="line" href="encode_8c.html#a5732d87decbffe771159ea02a5e25488">   26</a></span><span class="keywordtype">int</span> <a class="code hl_function" href="encode_8c.html#a5732d87decbffe771159ea02a5e25488">coap_flsll</a>(<span class="keywordtype">long</span> <span class="keywordtype">long</span> i)</div>
<div class="line"><a id="l00027" name="l00027"></a><span class="lineno">   27</span>{</div>
<div class="line"><a id="l00028" name="l00028"></a><span class="lineno">   28</span>  <span class="keywordtype">int</span> n;</div>
<div class="line"><a id="l00029" name="l00029"></a><span class="lineno">   29</span>  <span class="keywordflow">for</span> (n = 0; i; n++)</div>
<div class="line"><a id="l00030" name="l00030"></a><span class="lineno">   30</span>    i &gt;&gt;= 1;</div>
<div class="line"><a id="l00031" name="l00031"></a><span class="lineno">   31</span>  <span class="keywordflow">return</span> n;</div>
<div class="line"><a id="l00032" name="l00032"></a><span class="lineno">   32</span>}</div>
</div>
<div class="line"><a id="l00033" name="l00033"></a><span class="lineno">   33</span><span class="preprocessor">#endif</span></div>
<div class="line"><a id="l00034" name="l00034"></a><span class="lineno">   34</span> </div>
<div class="line"><a id="l00035" name="l00035"></a><span class="lineno">   35</span><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span></div>
<div class="foldopen" id="foldopen00036" data-start="{" data-end="}">
<div class="line"><a id="l00036" name="l00036"></a><span class="lineno"><a class="line" href="encode_8c.html#a7d12488893c3062c98bad1f4ab58455c">   36</a></span><a class="code hl_function" href="encode_8c.html#a7d12488893c3062c98bad1f4ab58455c">coap_decode_var_bytes</a>(<span class="keyword">const</span> <a class="code hl_typedef" href="uthash_8h.html#aba7bc1797add20fe3efdf37ced1182c5">uint8_t</a> *buf,<span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> len) {</div>
<div class="line"><a id="l00037" name="l00037"></a><span class="lineno">   37</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> i, n = 0;</div>
<div class="line"><a id="l00038" name="l00038"></a><span class="lineno">   38</span>  <span class="keywordflow">for</span> (i = 0; i &lt; len; ++i)</div>
<div class="line"><a id="l00039" name="l00039"></a><span class="lineno">   39</span>    n = (n &lt;&lt; 8) + buf[i];</div>
<div class="line"><a id="l00040" name="l00040"></a><span class="lineno">   40</span> </div>
<div class="line"><a id="l00041" name="l00041"></a><span class="lineno">   41</span>  <span class="keywordflow">return</span> n;</div>
<div class="line"><a id="l00042" name="l00042"></a><span class="lineno">   42</span>}</div>
</div>
<div class="line"><a id="l00043" name="l00043"></a><span class="lineno">   43</span> </div>
<div class="line"><a id="l00044" name="l00044"></a><span class="lineno">   44</span><span class="keywordtype">unsigned</span> <span class="keywordtype">int</span></div>
<div class="foldopen" id="foldopen00045" data-start="{" data-end="}">
<div class="line"><a id="l00045" name="l00045"></a><span class="lineno"><a class="line" href="encode_8c.html#a6987668306bf69553f9b207a624c2d44">   45</a></span><a class="code hl_function" href="encode_8c.html#a6987668306bf69553f9b207a624c2d44">coap_encode_var_safe</a>(<a class="code hl_typedef" href="uthash_8h.html#aba7bc1797add20fe3efdf37ced1182c5">uint8_t</a> *buf, <span class="keywordtype">size_t</span> length, <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> val) {</div>
<div class="line"><a id="l00046" name="l00046"></a><span class="lineno">   46</span>  <span class="keywordtype">unsigned</span> <span class="keywordtype">int</span> n, i;</div>
<div class="line"><a id="l00047" name="l00047"></a><span class="lineno">   47</span> </div>
<div class="line"><a id="l00048" name="l00048"></a><span class="lineno">   48</span>  <span class="keywordflow">for</span> (n = 0, i = val; i &amp;&amp; n &lt; <span class="keyword">sizeof</span>(val); ++n)</div>
<div class="line"><a id="l00049" name="l00049"></a><span class="lineno">   49</span>    i &gt;&gt;= 8;</div>
<div class="line"><a id="l00050" name="l00050"></a><span class="lineno">   50</span> </div>
<div class="line"><a id="l00051" name="l00051"></a><span class="lineno">   51</span>  <span class="keywordflow">if</span> (n &gt; length) {</div>
<div class="line"><a id="l00052" name="l00052"></a><span class="lineno">   52</span>    <a class="code hl_define" href="mem_8c.html#a3d4ae9c092e117c836f52dc7d7cee574">assert</a> (n &lt;= length);</div>
<div class="line"><a id="l00053" name="l00053"></a><span class="lineno">   53</span>    <span class="keywordflow">return</span> 0;</div>
<div class="line"><a id="l00054" name="l00054"></a><span class="lineno">   54</span>  }</div>
<div class="line"><a id="l00055" name="l00055"></a><span class="lineno">   55</span>  i = n;</div>
<div class="line"><a id="l00056" name="l00056"></a><span class="lineno">   56</span>  <span class="keywordflow">while</span> (i--) {</div>
<div class="line"><a id="l00057" name="l00057"></a><span class="lineno">   57</span>    buf[i] = val &amp; 0xff;</div>
<div class="line"><a id="l00058" name="l00058"></a><span class="lineno">   58</span>    val &gt;&gt;= 8;</div>
<div class="line"><a id="l00059" name="l00059"></a><span class="lineno">   59</span>  }</div>
<div class="line"><a id="l00060" name="l00060"></a><span class="lineno">   60</span> </div>
<div class="line"><a id="l00061" name="l00061"></a><span class="lineno">   61</span>  <span class="keywordflow">return</span> n;</div>
<div class="line"><a id="l00062" name="l00062"></a><span class="lineno">   62</span>}</div>
</div>
<div class="line"><a id="l00063" name="l00063"></a><span class="lineno">   63</span> </div>
<div class="ttc" id="acoap_8h_html"><div class="ttname"><a href="coap_8h.html">coap.h</a></div></div>
<div class="ttc" id="aencode_8c_html_a5732d87decbffe771159ea02a5e25488"><div class="ttname"><a href="encode_8c.html#a5732d87decbffe771159ea02a5e25488">coap_flsll</a></div><div class="ttdeci">int coap_flsll(long long i)</div><div class="ttdef"><b>Definition</b> <a href="encode_8c_source.html#l00026">encode.c:26</a></div></div>
<div class="ttc" id="aencode_8c_html_a671b4261b2d24de8696258a8efb0f359"><div class="ttname"><a href="encode_8c.html#a671b4261b2d24de8696258a8efb0f359">coap_fls</a></div><div class="ttdeci">int coap_fls(unsigned int i)</div><div class="ttdef"><b>Definition</b> <a href="encode_8c_source.html#l00020">encode.c:20</a></div></div>
<div class="ttc" id="aencode_8c_html_a6987668306bf69553f9b207a624c2d44"><div class="ttname"><a href="encode_8c.html#a6987668306bf69553f9b207a624c2d44">coap_encode_var_safe</a></div><div class="ttdeci">unsigned int coap_encode_var_safe(uint8_t *buf, size_t length, unsigned int val)</div><div class="ttdoc">Encodes multiple-length byte sequences.</div><div class="ttdef"><b>Definition</b> <a href="encode_8c_source.html#l00045">encode.c:45</a></div></div>
<div class="ttc" id="aencode_8c_html_a7d12488893c3062c98bad1f4ab58455c"><div class="ttname"><a href="encode_8c.html#a7d12488893c3062c98bad1f4ab58455c">coap_decode_var_bytes</a></div><div class="ttdeci">unsigned int coap_decode_var_bytes(const uint8_t *buf, unsigned int len)</div><div class="ttdoc">Decodes multiple-length byte sequences.</div><div class="ttdef"><b>Definition</b> <a href="encode_8c_source.html#l00036">encode.c:36</a></div></div>
<div class="ttc" id="aencode_8h_html"><div class="ttname"><a href="encode_8h.html">encode.h</a></div></div>
<div class="ttc" id="amem_8c_html_a3d4ae9c092e117c836f52dc7d7cee574"><div class="ttname"><a href="mem_8c.html#a3d4ae9c092e117c836f52dc7d7cee574">assert</a></div><div class="ttdeci">#define assert(...)</div><div class="ttdef"><b>Definition</b> <a href="mem_8c_source.html#l00018">mem.c:18</a></div></div>
<div class="ttc" id="amem_8h_html"><div class="ttname"><a href="mem_8h.html">mem.h</a></div></div>
<div class="ttc" id="authash_8h_html_aba7bc1797add20fe3efdf37ced1182c5"><div class="ttname"><a href="uthash_8h.html#aba7bc1797add20fe3efdf37ced1182c5">uint8_t</a></div><div class="ttdeci">unsigned char uint8_t</div><div class="ttdef"><b>Definition</b> <a href="uthash_8h_source.html#l00079">uthash.h:79</a></div></div>
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